Not all units listed below existed for the entire time that First Canadian Army was itself in existence; this should be considered a rough guide only. Thanks to Mark Tonner and Joe Costello for providing additional information, which came from a variety of sources, including the Canadian Forces Communications and Electronics Newsletter, 1986.

Headquarters Units
	Headquarters, First Canadian Army
	1 Air Survey Corps
	1 Air Liaison Group
	25 Armoured Delivery Regiment (The Elgin Regiment)
	32nd Reconnaissance Regiment (Royal Montreal Regiment)
Royal Canadian Artillery
	Headquarters, 2 Army Group, RCA (AGRA)
	191 Field Regiment, RA
	3 Medium Regiment, RCA
	4 Medium Regiment, RCA
	7 Medium Regiment, RCA
	15 Medium Regiment, RCA
	1 Heavy Regiment, RA
	1 Calibration Troop, RCA
	Headquarters, 1 Anti-Aircraft Brigade, RCA
	16 Anti-Aircraft Operations Room, RCA
	2 Heavy Anti-Aircraft Regiment, RCA
	109 Heavy Anti-Aircraft Regiment, RA
	7 Light Anti-Aircraft Regiment, RCA
	11 Light Anti-Aircraft Regiment, RCA
	661 Air Observation Post Squadron, RCA
Royal Canadian Engineers
	Headquarters, First Canadian Army Troops, RCE
	Headquarters Royal Engineers 4 Army Troops
	145 Field Park Company, RE
	24 Field Company, RE
	55 Field Company, RE
	629 Field Company, RE
	10 Field Park Company, RCE
	20 Field Company, RCE
	23 Field Company, RCE
	1 Workshop and Park Company, RCE
	Canadian Construction Engineer Workshop
	First Battalion, RCE
	Second Battalion, RCE
	Third Battalion, RCE
	1 Engineer Stores Section, RCE
	CRE Workshop
	1 Road Construction Company, RCE
	2 Road Construction Company, RCE
	2 Tunneling Company, RCE
	1 Mechanical Equipment Company, RCE
	1 Mechanical Equipment Park, RCE
	1 Field Survey Depot, RCE
	2 Field Survey Company, RCE
	3 Field Survey Company, RCE
	4 Field Survey Company, RCE
	30 Air Survey Liaison Section, RCE
Royal Canadian Corps of Signals
	Headquarters, First Canadian Army Signals
	3 Special Wireless Section (Type A)
	1 Special Wireless Section (Type B)
	2 Special Wireless Section (Type B)
	1 Relay Telephone Company
	1 Air Support Signal Unit
	3 Army Signal Park
Canadian Infantry Corps
	1st Canadian Army Defence Company (The Lorne Scots)
Royal Canadian Army Service Corps
	Headquarters, RCASC First Canadian Army Troops
	Headquarters, First Canadian Army Transport Column, RCASC
	35 Army Troops Composite Company, RCASC
	36 Army Troops Composite Company, RCASC
	85 Bridging Company, RCASC
	86 Bridging Company, RCASC
	65 Tank Transporter Company, RCASC
	66 Tank Transporter Company, RCASC
	69 General Transport Company, RCASC
	82 Artillery Company, RCASC
	87 Artillery Company, RCASC
	121 Detail Issue Depot, RCASC
Royal Canadian Army Medical Corps
	6 General Hospital, RCAMC
	6 Casualty Clearing Station, RCAMC
	14 Field Hygiene Section, RCAMC
	17 Light Field Ambulance, RCAMC
	5, 6, 7 and 8 Field Surgical Units, RCAMC
	9, 10, and 11 Field Dressing Stations, RCAMC
	4,5,6 and 7 Field Transfusion Units, RCAMC
	2 Advance Deployed Medical Stores, RCAMC
Canadian Dental Corps
	2 Dental Company, CDC
	4 Dental Company, CDC
	5 Dental Company, CDC
	6 Dental Company, CDC
	9 Dental Company, CDC
Royal Canadian Electrical and Mechanical Engineers
	HQ, RCEME First Canadian Army Troops
	2 Recovery Company, RCEME
	First Canadian Army Troops Workshop, RCEME
Royal Canadian Ordnance Corps
	1 Ordnance Rail Head Company, RCOC
	2, 3 and 5 Salvage Units, RCOC
	4 Mobile Laundry and Bath Unit
Royal Canadian Army Pay Corps
	11 Field Cash Office
Canadian Provost Corps
	11 Provost Company
	1 Traffic Control HQ Section
	21 Traffic Control Company
	27 Traffic Control Company
Canadian Postal Corps
	First Canadian Army Postal Unit
Canadian Intelligence Corps
	16 and 17 Field Security Section
	2 Wireless Intelligence Section
	3 Wireless Intelligence Section
	1 Army Photographic Interpretation Section
	1 Interrogation HQ Section
Miscellaneous Units
	1 Chemical Warfare Laboratory
	First Canadian Army Meteorological Group
	First Canadian Army Reception Camp
	1 Field Punishment Camp
	1 Auxiliary Service Section